Gear-synchronizing type dual hollow shaft hinge



FIG. 1 is a perspective view of gear-synchronizing type dual hollow shaft hinge showing the design;

FIG. 2 is a front side elevation view thereof;

FIG. 3 is a rear side elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is another perspective view of gear-synchronizing type dual hollow shaft hinge showing the design;

FIG. 9 is still another perspective view of gear-synchronizing type dual hollow shaft hinge showing the design; and,

FIG. 10 is still another perspective view of gear-synchronizing type dual hollow shaft hinge showing the design. 

CLAIM The ornamental design for gear-synchronizing type dual hollow shaft hinge, as shown and described. 